They are used in accoutancy, temperature and alot of other places
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Negative numbers are simply a continuation of the number line past zero. They indicate a deficit. Without negative numbers, you would not be able to do simple things, such as subtract 5 from 3.
The tally marks I'm familiar with cannot have negative numbers because they are used to count real things and there cannot be a negative apple
The product of three negative numbers is negative.
They will be negative numbers as for example -5+(-7) = -12
Negative numbers are often found in measurements. They are used to represent numbers that have sunk below 0 (ex: temperature, debt) or have become the inverse of a number (velocity, energy, negative exponents). Without machines of sorts negative numbers are very rare in everyday life, but so are very large numbers or very small numbers.